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Selecting all "John"s

How would you write an SQL statement that would select all of the customers (records) which have the substring "John" in their name from a table called customers?

The LIKE operator and the % wildcard token would be the best bet here:

select * from Customers
  where FullName like '%john%';
If you are using a case-sensitive collation sequence, and you wish to select rows with FullName containing "john" regardless of case, then I would suggest using an operator like LOWER to force a case-insensitive condition. Here's the SQL:
select * from Customers
  where lower(FullName) like '%john%';

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